Is it permissible for someone to make a supplication to Allah to marry an already married, or an engaged woman?
No, it isn`t, and the person who does so is sinful before Allah, The Almighty.
A person prays in a certain spot within the rows of the mosque, and gets angry if someone else prayed at his spot. What is the ruling on this behavior?
All Perfect Praise be to Allah The Lord of The Worlds and may His Peace and blessings be upon our Prophet Muhammad and upon all of his family and companions Prophet Mohammad (PBUH) make it prohibited for a Muslim from having/taking a certain spot in the mosque when performing prayers if they arrived and find it occupied, furthermore; it is the religious duty on others (praying people) to offer a piece of advice to alert the ones who don't know, that whoever reaches a spot first at the mosque having a priority/privilege upon others in that spot. And Allah Knows Best.
I`m a married young man. I fell in love with a widow and proposed to her but her family refused because they feared that this would have an adverse impact on the future of her children. However, we entered into unregistered marriage and told my family and even my wife about it. I`m a person who fears Allah, The Almighty and want to clear myself from any liability before Him, The Exalted. What should I do?
All perfect praise be to Allah the Lord of The Worlds. May His blessings and peace be upon our Prophet Mohammad and upon all his family and companions.
It is imperative that you proclaim this marriage to preserve rights. Therefore, you must register it in an Islamic court. A second marriage isn`t forbidden, however, if the unregistered marriage had taken place without the consent of the woman`s guardian nor the presence of two honorable witnesses, then it is considered void and your relationship with this woman is forbidden. Therefore, you must conclude a new marriage contract with the approval of her guardian and the presence of two honorable witnesses. We advise you to fear Allah and adhere to the teachings of Sharia in this regard since sinful conduct is that which turns in your heart (making you feel uncomfortable) and you dislike that it would be disclosed to other people. And Allah The Almighy Knows Best.
Should a person feel pleased, or have a virtuous vision after offering Istikhara (guidance prayer) in order to do what he/she had offered it for?
The result of the Istikhaarah is not necessarily that a person sees something (in his dream), or feels pleased, but the most important result of the Istikhaarah is whether a person is enabled to do a given matter or not.